RF Shield for RFID circuit in portable equipment

I'm doing the layout of a battery powered portable device with both Bluetooth and a RFID circuit. The BLE module has an integrated antenna and the IC based RFID circuit will use and external antenna. The two circuits are sandwiched on opposite sides of a 6 layer PCB.

End user is concerned that emissions from the RFID circuit will interfere with the BLE circuit and may also cause excessive radiated emissions and has requested the RFID circuit be contained in a RF shield such as this one, to help contain the RFID emissions:
http://www.digikey.ca/product-detail...497-ND/2337472

I'm also planning to use one of the inner layers as a shield and connect that plane to the RF shield can.

Should the RF shield be connected to battery ground, or some other point?

If connected to battery ground should the connection be direct or via some sort of R-L-C network?

The power ground from both devices is battery negative.

Any other advice is welcome.

for that shield to work, there has to be a "ground plane" somewhere inside of the PC board. you connect that metal shield to the ground plane in numerous places and try to make a faraday cage. unfortunately, since you need an antenna external to the shield....you are going to be deliberately screwing up the faraday cage, and may need to add a lowpass or highpass filter between the antenna and the RFID chip.

And since the negative terminal of the battery connects to the chip "ground" pins, yes connecting the battery negative to the metal shield is probably a good idea.